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ADC912A

Analog Devices
Part Number ADC912A
Manufacturer Analog Devices
Description CMOS Microprocessor-Compatible 12-Bit A/D Converter
Published Mar 24, 2005
Detailed Description a FEATURES Low Cost Low Transition Noise between Code 12-Bit Accurate ؎1/2 LSB Nonlinearity Error over Temperature No Mi...
Datasheet PDF File ADC912A PDF File

ADC912A
ADC912A

Overview
a FEATURES Low Cost Low Transition Noise between Code 12-Bit Accurate ؎1/2 LSB Nonlinearity Error over Temperature No Missing Codes at All Temperatures 10 ␮ s Conversion Time Internal or External Clock 8- or 16-Bit Data Bus Compatible Improved ESD Resistant Design Latchup Resistant Epi-CMOS Processing Low 95 mW Power Consumption Space-Saving 24-Lead 0.
3" DIP, or 24-Lead SOIC APPLICATIONS Data Acquisition Systems DSP System Front End Process Control Systems Portable Instrumentation GENERAL DESCRIPTION CMOS Microprocessor-Compatible 12-Bit A/D Converter ADC912A FUNCTIONAL BLOCK DIAGRAM AGND VREFIN AIN 5k⍀ 12-BIT DAC VDD VSS ADC912A SUCCESSIVE APPROXIMATION REGISTER 12-BIT LATCH 4 8 CONTROL LOGIC BUSY CS RD HBEN MULTIPLEXER 8 THREE-STATE OUTPUT DRIVERS THREE-STATE OUTPUT DRIVERS CLOCK OSCILLATOR CLK OUT CLK IN D11 D8 D7 D4 DGND D3/11 D0/8 The ADC912A is a monolithic 12-bit accurate CMOS A/D converter.
It contains a complete successive-approximation A/D converter built with a high-accuracy D/A converter, a precision bipolar transistor high-speed comparator, and successiveapproximation logic including three-state bus interface for logic compatibility.
The accuracy of the ADC912A results from the addition of precision bipolar transistors to Analog Devices’ advanced-oxide isolated silicon-gate CMOS process.
Particular attention was paid to the reduction of transition noise between adjacent codes achieving a 1/6 LSB uncertainty.
The low noise design produces the same digital output for dc analog inputs 256 not located at a transition voltage, see Figures 1 and 2.
NPN digital output transistors provide excellent bus interface timing, 125 ns access and bus disconnect time which results in faster data transfer without the need for wait states.
An external 1.
25 MHz clock provides a 10 µs conversion time.
In stand-alone applications an internal clock can be used with external crystal.
An external negative five-volt reference sets the 0 V to 10 V input range.
Plus 5 V ...


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